NATE Air Conditioning and Heat Pump Study Questions and Answers 2023

NATE Air Conditioning and Heat Pump Study Questions and Answers 2023 A cooling load calculation estimates the sensible heat gain of the structure. The cooling-only system should be within _____% of this calculated value. - ANSWER-+15% The maximum sensible cooling capacity of a heat pump should be within ______% of the calculated sensible heat gain of a structure with a large heating load. - ANSWER-+25% The combined output of a heatpump and its auxiliary heat should not exceed the calculated heat loss of a home by more than ____%. - ANSWER-15% What amount of auxiliary electronic heat is needed when the output of a heat pump on a design day equals 18,800 Btuh and the heat loss of a home is 29,700 Btuh? - ANSWER-3.2 kWh The three processes that transfer heat energy are conduction, convection, and _________. - ANSWER-Radiation Heat transfer that occurs when substances of different temperatures are in contact with each other is called _______. - ANSWER-conduction What effect does raising the pressure in a sealed system have on refrigerant? - ANSWER-The boiling point increases What is the primary danger to people near an accidental refrigerant release or spill? - ANSWER-suffocation caused by the heavier refrigerant displacing oxygen in the air The maximum temperature at which refrigerant may be stored is ______ F when the container is no more than ____% full of liquid by volume.; - ANSWER-125 F, 80% Boiling of the refrigerant occurs in which system component? - ANSWER-Evaporator Why is superheat necessary in a system that utilizes hermetic compressors - ANSWER-It ensures that dry vapor reaches the compressor so that mechanical damage does not occur